You’d think that by now we’ve had seen all there is to see when it comes to different editions of Samsung’s Galaxy S III. We’ve seen the phone with Exynos 4 chips, with 2GB of RAM, and with what seems like every combination of radio support under the sun. The story may not be quite over yet, though, as an unknown Samsung handset has popped-up in the Bluetooth SIG’s database, and it sure sounds like a new Galaxy S III, possibly for T-Mobile.

The GS3 for T-Mobile we’re already familiar with is model SGH-T999. Of course, that means support for HSPA+ on the carrier’s AWS band, which also makes it perfect for use on a couple Canadian networks. Unlike all the other GS3 models released in North America, the T999 lacks an LTE radio.

This new Bluetooth listing is for a model SGH-T999L. For the moment, we don’t have any hard evidence about how it might differ from the first T999, but that letter “L” there is fueling speculation that it could be an LTE-enabled version of its predecessor. While that wouldn’t be very useful for the moment, once T-Mobile starts flipping-on LTE service in 2013, this just might be one of the first phones around to support it.

For now, that’s all very speculative, but until we learn more about this model, it’s one theory at least worth keeping in mind.